Do you mean the zero covid strategy or the easing of restrictions?
The tight controls only made any sense in the context of buying time to come up with better solutions - vaccines, treatments, testing etc. China bought time, at very high cost in economic and social terms.
In the end they were asking the young and the working generation to save the lives of the old, despite many of the old choosing not to take the basic step of protecting themselves through vaccination.
In China the over 80s are the least vaccinated group. In most of the world that group (the most at risk of death and serious illness) are amongst the most vaccinated - in some countries (like the UK, NZ, Singapore) they are almost all vaccinated.
For Singapore and NZ, strict controls were gradually eased as vaccination levels climbed, they've kept the deaths to a minimum and they've not allowed their health services to collapse under the sudden weight of new cases.
Hong Kong showed how fast things can go wrong. Seeing it happen probably has helped push up vaccination rates in China, but the rates still aren't great, and the vaccines aren't the best. China will see a lot of unnecessary deaths. They shouldn't see the kind of death rates that hit countries like the UK (pre vaccine) but they're unlikely to perform as well as Singapore say.
A lot of time wasted, a lot of people who've gone through miserable experiences, a range of economic damage done and a less than ideal set of health outcomes.
A not too technical article on what's likely to happen next: